epan/dissectors/packet-aruba-erm.c

   1 /* packet-aruba-erm.c
   2  * Routines for the disassembly of Aruba encapsulated remote mirroring frames
   3  * (Adapted from packet-hp-erm.c and packet-cisco-erspan.c)
   4  *
   5  * $Id$
   6  *
   7  * Copyright 2010  Alexis La Goutte <alexis.lagoutte at gmail dot com>
   8  *
   9  * Wireshark - Network traffic analyzer
  10  * By Gerald Combs <gerald@wireshark.org>
  11  * Copyright 1998 Gerald Combs
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  26  */
  27
  28 /*
  29  * Format:
  30  *  Use the Header of Record (Packet) Header
  31  *
  32  * typedef struct pcaprec_hdr_s {
  33  *       guint32 ts_sec;          timestamp seconds
  34  *       guint32 ts_usec;         timestamp microseconds
  35  *       guint32 incl_len;        number of octets of packet saved in file
  36  *       guint32 orig_len;        actual length of packet
  37  * } pcaprec_hdr_t;
  38  *
  39  * Following with 802.11 header
  40  */
  41
  42 #include "config.h"
  43
  44 #include <glib.h>
  45 #include <epan/packet.h>
  46 #include <epan/prefs.h>
  47
  48 #define PROTO_SHORT_NAME "ARUBA_ERM"
  49 #define PROTO_LONG_NAME  "ARUBA encapsulated remote mirroring"
  50
  51 void proto_register_aruba_erm(void);
  52 void proto_reg_handoff_aruba_erm(void);
  53
  54 static range_t *global_aruba_erm_port_range;
  55
  56 static int  proto_aruba_erm       = -1;
  57
  58 static int  hf_aruba_erm_time     = -1;
  59 static int  hf_aruba_erm_incl_len = -1;
  60 static int  hf_aruba_erm_orig_len = -1;
  61
  62 static gint ett_aruba_erm         = -1;
  63
  64 static dissector_handle_t aruba_erm_handle;
  65 static dissector_handle_t ieee80211_handle;
  66
  67 static void
  68 dissect_aruba_erm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  69 {
  70     proto_item *ti;
  71     proto_tree *aruba_erm_tree;
  72     tvbuff_t   *eth_tvb;
  73     nstime_t ts;
  74
  75     col_set_str(pinfo->cinfo, COL_PROTOCOL, PROTO_SHORT_NAME);
  76     col_set_str(pinfo->cinfo, COL_INFO, PROTO_SHORT_NAME ":");
  77
  78     if (tree) {
  79         ti = proto_tree_add_item(tree, proto_aruba_erm, tvb, 0, -1, ENC_NA);
  80         aruba_erm_tree = proto_item_add_subtree(ti, ett_aruba_erm);
  81
  82         ts.secs = tvb_get_ntohl(tvb, 0);
  83         ts.nsecs = tvb_get_ntohl(tvb,4)*1000;
  84         proto_tree_add_time(aruba_erm_tree, hf_aruba_erm_time, tvb, 0, 8,&ts);
  85         proto_tree_add_item(aruba_erm_tree, hf_aruba_erm_incl_len, tvb, 8, 4, ENC_BIG_ENDIAN);
  86         proto_tree_add_item(aruba_erm_tree, hf_aruba_erm_orig_len, tvb, 12, 4, ENC_BIG_ENDIAN);
  87     }
  88
  89     eth_tvb = tvb_new_subset_remaining(tvb, 16);
  90     call_dissector(ieee80211_handle, eth_tvb, pinfo, tree);
  91 }
  92
  93 void
  94 proto_register_aruba_erm(void)
  95 {
  96
  97     static hf_register_info hf[] = {
  98
  99         { &hf_aruba_erm_time,
 100           { "Packet Capture Timestamp", "aruba_erm.time", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL,
 101             0x00, NULL, HFILL }},
 102         { &hf_aruba_erm_incl_len,
 103           { "Packet Captured Length", "aruba_erm.incl_len", FT_UINT32, BASE_DEC, NULL,
 104             0x00, NULL, HFILL }},
 105         { &hf_aruba_erm_orig_len,
 106           { "Packet Length", "aruba_erm.orig_len", FT_UINT32, BASE_DEC, NULL,
 107             0x00, NULL, HFILL }},
 108     };
 109
 110     static gint *ett[] = {
 111         &ett_aruba_erm,
 112     };
 113
 114     module_t *aruba_erm_module;
 115
 116     proto_aruba_erm = proto_register_protocol(PROTO_LONG_NAME, PROTO_SHORT_NAME, "aruba_erm");
 117
 118     range_convert_str (&global_aruba_erm_port_range, "0", MAX_UDP_PORT);
 119     aruba_erm_module = prefs_register_protocol(proto_aruba_erm, proto_reg_handoff_aruba_erm);
 120     prefs_register_range_preference(aruba_erm_module, "udp.ports", "ARUBA_ERM UDP Port numbers",
 121                                     "Set the UDP port numbers (by default is range 5555 to 5560) used for ARUBA"
 122                                     " encapsulated remote mirroring frames;\n"
 123                                     "0 (default) means that the ARUBA_ERM dissector is not active\n",
 124                                     &global_aruba_erm_port_range, MAX_UDP_PORT);
 125
 126     proto_register_field_array(proto_aruba_erm, hf, array_length(hf));
 127     proto_register_subtree_array(ett, array_length(ett));
 128 }
 129
 130 void
 131 proto_reg_handoff_aruba_erm(void)
 132 {
 133     static range_t *aruba_erm_port_range;
 134     static gboolean initialized = FALSE;
 135
 136     if (!initialized) {
 137         ieee80211_handle = find_dissector("wlan");
 138         aruba_erm_handle = create_dissector_handle(dissect_aruba_erm, proto_aruba_erm);
 139         initialized = TRUE;
 140     } else {
 141         dissector_delete_uint_range("udp.port", aruba_erm_port_range, aruba_erm_handle);
 142         g_free(aruba_erm_port_range);
 143     }
 144
 145     aruba_erm_port_range = range_copy(global_aruba_erm_port_range);
 146
 147     dissector_add_uint_range("udp.port", aruba_erm_port_range, aruba_erm_handle);
 148 }
 149